Question about Zephyr Cyclone AK6500 Kitchen Hood

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Fan reve up and then go back down.

The vent fan reves up and then after a while it go back down for a few minutes. Also, seems like the air is blowing down instead of sucking up on one side. is this normal? are the lights supposed to be a certain type of r14s? I saw some that was for under cabinet lighting.

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